if (vol->sb->s_rev_level == EXT4_DYNAMIC_REV &&
(vol->sb->s_feature_incompat & ~(EXT4_FEATURE_INCOMPAT_FILETYPE | EXT4_FEATURE_INCOMPAT_RECOVER |
- EXT4_FEATURE_INCOMPAT_EXTENTS)))
+ EXT4_FEATURE_INCOMPAT_EXTENTS | EXT4_FEATURE_INCOMPAT_FLEX_BG)))
return FSW_UNSUPPORTED;